Declension table of ?mantrayitavya

Neuter	Singular	Dual	Plural
Nominative	mantrayitavyam	mantrayitavye	mantrayitavyāni
Vocative	mantrayitavya	mantrayitavye	mantrayitavyāni
Accusative	mantrayitavyam	mantrayitavye	mantrayitavyāni
Instrumental	mantrayitavyena	mantrayitavyābhyām	mantrayitavyaiḥ
Dative	mantrayitavyāya	mantrayitavyābhyām	mantrayitavyebhyaḥ
Ablative	mantrayitavyāt	mantrayitavyābhyām	mantrayitavyebhyaḥ
Genitive	mantrayitavyasya	mantrayitavyayoḥ	mantrayitavyānām
Locative	mantrayitavye	mantrayitavyayoḥ	mantrayitavyeṣu

Compound mantrayitavya -

Adverb -mantrayitavyam -mantrayitavyāt